Tim:
If I read this correct, you are taking a speaker level signal into a
microphone level input. Chances are that you are driving the input into
distortion, pre any gain control or level control stage on the mixer.
Secondly, the phone output level of a mixer is only slightly above line
level and is designed to drive a much higher Z than a speaker. Also, it is
most likely rated at a few milliwatts of power where a speaker needs an amp
of 2 or 3 watts (2000 to 3000 milliwatts) to be clean.
I doubt that you have an RFI problem.
I suggest that you place some 20 to 40 dB loss attenuation between the
speaker out of the radio to the input of the mixer. A simple 5 to 10 K pot
will do the trick and allow you to make adjustments to suit yourself.
However, to drive a speaker from the phone output of the mixer, you'll need
to put a audio amp capable of some 5 or more watts between the mixer and the
speaker. This most likely will address your concerns.
73
Bob, K4TAX
----- Original Message -----
From: <tlogan7@cox.net>
To: "tentec reflector" <tentec@contesting.com>
Sent: Sunday, March 02, 2003 12:29 PM
Subject: [TenTec] RFI and Behringer MX-602a
> Hi folks -
> Been fooling around abit with the above mixer. Seems pretty great for
> receive but sure distorts/ruins cw sending. I'm assuming the terrible
sound
> of my cw sig is from RFI - in which case I probably won't spend much time
> trying to fix it. Any adjustments to gain and other settings does not
cure
> it.
> I run the speaker into the phone input and am using channel 1 from the
> mixer to the rigs speaker out - no amp or anything. Any suggestions other
> than normal RFI cures or is there something about setting the mixer that I
> may be missing? If it's RFI the mixer goes - not worth the effort to me
> since I'm not real heavy into the audio manipulation part - in case
anybody
> wants to buy a mixer.
> Thanks folks.
> 73/Tim NZ7C
>
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